Bevel-polishing machine.



No. 868,877- PATENTED OUT. 22'. 1907. H. LOHMANN.

BEVEL POLISHING MACHINE.

APPLICATION FILED JULY 26. 1900.

Min/@3565: 31 9 1' z" i I flu/8117502,: 97?? fiez'nrich 11011112211111UNITED STATES PATENT OFFICE.

BEVE L-POLISHING MACHINE.

Specification of Letters Patent.

Patented Oct. 22, 1907.

Application filed July 25,1906. Serial No. 327,763.

To all whom it may concern.-

Be it known that l, HEINRICH LOI-IMANN, asubject of the King of Prussia,residing at AiX-la-Cl1apelle, No. 109 Liittichersirasse, in the Kingdomof Prussia, Em piro of German y. have invented certain new and use lulImprovements in Bevel-Polishing Machines and I do hereby declare theiollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

H y present in vention relates to a machine for polishing bevcls andmore particularly bevcls of plate-glass, in which the polishing-toolsexecute one oscillating movement during the same time they execute aseries of linear motions, whereby not only considerable time is savedbut also the deeper lying cavities in the bevels are provided with justas high a degree of polish as usually only the higher lying parts of thebevcls receive, because such cavities cannot be reached by the head of apolishing-tool which simply moves back and forth on a straight line.

In the accompanying drawing:Figure l. is a side elevation of the newbevelpolishing machine. Fig. 2 is a plan view oi said bevel-polishingmachine With certain parts shown in section. 01' the machine with partsshown in section with the driving in cans.

On the table 1 a slide-way 2 is arranged for the slide 3, which isguided by the rib 1 and carries the polishingtools 5. polishing-head 32and of a vertical spindle 10 to which the polishing-hind is hinged in amanner that the latter can adapt itself freely to any bevel to bepolished. The polishing-head is pressed against the bevel by weight 35carried by said spindle, but can be raised and retained in its elevatedposition by a hand-operated stoplever as will be more lully explainedlater on. The slide 3 receives its motion from the eccentric [i seatedon the driving shalt 7, which may be either a motorshaft, as indicated,or a lino-shalt, as circumstances may direct. The transmission of themotion of the eccentric (5 to the slide 3 is accomplished by means ofthe eccentric-rod 8. in the known bevel-polishing machines the polish iug-tools 5 are simply moved back and forth on a straight line, whicharrangement shows this drawback that at places where cavities are groundinto the bcvels of the glass-plate 9 such bevels cannot be faultlesslypolished. lhis drawback is avoided by the present beve1polishing machineby letting the polishing-tools accomplish a slow oscillating movementduring the time they execute a series oi linear motions, which isaccomplished in the following manner:To the spindle 10 of ca chpolishing-tool 5 an arm 11 is attached in any suitable manner or made toform an integral part thereof, and the free ends of these arms are heldin recesses 'l 2 of the bar 13 which is guided in the Fig. 3 is an endview l lach polishing-tool consists of a leltl'aced forked ends of theposts 14 secured to the slide 3. With one end of this bar is connectedthe one arm of the bell-crank 15 fulcrumed in the bracket 16 likewisesecured to the slide 3. The other arm of the bellcrank 15 is connectedwith a rod 17 which swings on a pin 18 of the lever 19 fulcrumed to theover-head bracket 20. To the pin 21 arranged on the other side of thelever 19 the rod 22 is pivoted and connected at its lower end with thehorizontal arm of the bellcrank 23 pivoted to the bracket 24 arrangedsidewise oi the slide 3 on the table 1. The second arm of the bell-crank23 is attached to the turned-up arm of the double-armed lever 25 pivotedon the pin 26 likewise secured to the table 1. The longer arm of thisdouble-armed lever is attached to the connecting-rod 27 by means of thelink 28, which rod receives its motion from the crank-pin 29 of thewheel 30 driven by the pinion 31 of the motor shaft 7.

It is evident that the ratio the slow oscillating movement of thepolishing-tools bears to the number of times the linear motions of thepolishing-tools are executed during the same unit of time wholly dependson the ratio the pinion 31 bears tothe wheel 30, and

that the angle a described by the oscillating heads 32 of thepolishing-tools 5 is given by the linear motion of the bar 13. Thisarrangement of parts offers, besides the advantages enumerated above,this advantage that the polishing material can be retained between theheads 32 and the bevel without difficulty.

The operation of the machine is follows:At each revolution 01' thedriving-shalt 7 the slide 3 will be moved once back and forth, duringwhich motion the rod 17 linked to the bcllcrank 15 will swing once'toand l'ro but as the bar 13 takes part on this motion of the slide 3 itcannot oscillate the polishing-tools 5. Besides this oscillating motionof the rod 17, caused by the motions of the slide 3, it is compelled toexecute simultaneously therewith an up and down movement through theinstrumentality of the parts 19, 22, 23, 25 and 27 operated by the wheel30 and pinion 31. This up and down movement of the rod 17 depends onratio the wheel and pinion bear one to another and will take place onlyonce during the same time a series of revolutions of the shaft 7 or thesame series of back and forth motions of the slide 3 is executed. The upand down movements of the rod 17 cause the swinging motions of thebell-crank 15 and therefore the linear motion of the bar 13, whereby thepolishing-tools 5 are slowly oscillated because said bar operates thearms 11. As during these combined motions oi the polishing-tools thelatter always shift their position on the bevel, and the heads 32 arehinged to the weighted spindles 10 of the polishing-tools in such amanner that they can easily accommodate themselves to the bevel, apolished bevel is obtained which shows at every point such a degree ofhigh polish as hitherto was only obtainable by the far more expensiveskilled hand labor. After the bevel has been polished the longer arms oflevers 33 fulcrumed adjacent of the'spindles 10 on top of the tubularguides of the brackets 34 are pushed down in order to lift the weights35, which carry the spindles 10, and the heads 32 of the polishing tools5 off the polished bevel. The glass-plate can now be drawn back andshifted to bring another of its bevels beneath the polishing heads 32,or it may be replaced by a new one altogether, as the case may be. Aftera new bevel has been placed beneath said polishing-heads the levers 33are manipulated again, but in a reverse Way than formerly, to bring saidpolishingheads in contact with said bevel, whereupon the polishingoperation is commenced anew.

I claim:

1. A bevel-polishing machine comprising polishing-tools capable ofexecuting reciprocating and oscillating motions simultaneously in a trueplane, means for causingthe re ciprocating motions of saidpolishing-tools, and means for oscillating said polishing-tools aroundtheir respective cen ters independent of the means causing saidreciprocating motions of said polishing tools.

2. A bevel-polishing machine comprising polishing-tools capable ofexecuting linear and oscillating motions simultaneously, a slidesupporting said polishing-tools, means for moving said slide back andforth, arms carried by said polishing-tools, a bar slidingly arrangedupon said slide and straddling said arms, and means for moving said barindependent of the slide carrying it.

3. In a bevel-polishing machine of the kind described the combinationwith a table of a slideway, a slide ar ranged on said slide-way, meansfor imparting linear motion to said slide, brackets on said slide,polishing-tools carried by said brackets, means on said brackets forlifting said polishing-tools off the work-piece, arms on saidpolishing-tools, forked posts on said slide, a bar slidingly held in theforked ends of said posts and straddling the free ends of said arms, andmeans for imparting a linear motion to said bar independent of thelinear motion of the slide carrying it to oscillate said polishing toolsonce during the same unit of time they are executing a series of linearmotions.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HEINRICH LOUMANN.

Witnesses:

HENRY QUADFLIRG, LILLY KAIll'l.

